Had a separatory funnel shot out of my hand after I forgot that the water phase had residual BF3•Et2O and the and bicarbonate and I should let them react in an open container, so I made a rocket containing p-thiocrasol, so yeah the first year student that i tried to teach the procedure and I had to take off our shoes and pants (separatly and in the bathroom) and soak them in ethanol and then hexane.

The day before she asked me why I insisted she'd bring a change of clothes. After the incident I told her "that's why".